| Year | Count |
|---|---|
| 1970 | 16 |
| 1971 | 20 |
| 1975 | 14 |
| 1976 | 35 |
| 1977 | 7 |
| 1978 | 7 |
| 1979 | 9 |
| 1981 | 23 |
| 1982 | 11 |
| 1983 | 7 |
| 1984 | 9 |
| 1985 | 43 |
| 1986 | 27 |
| 1987 | 39 |
| 1988 | 21 |
| 1989 | 37 |
| 1990 | 10 |
| 1991 | 55 |
| 1992 | 53 |
| 1993 | 18 |
| 1994 | 42 |
| 1995 | 72 |
| 1996 | 75 |
| 1997 | 82 |
| 1998 | 66 |
| 1999 | 68 |
| 2000 | 68 |
| 2001 | 13 |
| 2002 | 27 |
| 2003 | 44 |
| 2004 | 67 |
| 2005 | 84 |
| 2006 | 72 |
| 2007 | 101 |
| 2007 | 5 |
| 2008 | 96 |
| 2009 | 51 |
| 2010 | 112 |
| 2011 | 97 |
| 2011 | 20 |
| 2012 | 81 |
| 2012 | 5 |
| 2013 | 80 |
| 2014 | 98 |
| 2014 | 24 |
| 2015 | 108 |
| 2016 | 107 |
| 2016 | 15 |
| 2017 | 171 |
| 2018 | 83 |
| 2019 | 119 |
| 2020 | 99 |
| 2021 | 89 |
| 2021 | 7 |
| 2022 | 98 |
| 2022 | 5 |
| 2023 | 77 |
| 2024 | 68 |
| 2024 | 11 |